If you can see DataDomain SCSI devices in the Device Manager on the proxy server please read following:
According to EMC Data Domain Boost Compatibility Guide (rev 19):
PowerPath v6.0 or greater on Windows, with the General Purpose Extension (GPX)
enabled.
PowerPath v5.7 or earlier on Windows, with the General Purpose Extension (GPX)
This means if you are using PowerPath v5.7 or earlier, GPX has to be disabled in order to work with DDboost.
PowerPath v6.0 or later should work with DDboost when GPX is enabled.
If you cannot see DataDomain SCSI devices in the Device Manager on the proxy server please read following:
According to EMC Data Domain Operating System Administration Guide:
Select one or more initiators. Optionally, replace the initiator name by entering a new one. An initiator is a backup client that connects to the system to read and write data using the FC (Fibre Channel) protocol. A specific initiator can support DD Boost over FC or VTL, but not both.